// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_CERT_MULTI_LOG_CT_VERIFIER_H_
#define NET_CERT_MULTI_LOG_CT_VERIFIER_H_

#include <map>
#include <string>

#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "net/base/net_export.h"
#include "net/cert/ct_verifier.h"
#include "net/cert/signed_certificate_timestamp.h"

namespace net {

namespace ct {
    struct LogEntry;
} // namespace ct

class CTLogVerifier;

// A Certificate Transparency verifier that can verify Signed Certificate
// Timestamps from multiple logs.
// It must be initialized with a list of logs by calling AddLogs.
class NET_EXPORT MultiLogCTVerifier : public CTVerifier {
public:
    MultiLogCTVerifier();
    ~MultiLogCTVerifier() override;

    void AddLogs(
        const std::vector<scoped_refptr<const CTLogVerifier>>& log_verifiers);

    // CTVerifier implementation:
    int Verify(X509Certificate* cert,
        const std::string& stapled_ocsp_response,
        const std::string& sct_list_from_tls_extension,
        ct::CTVerifyResult* result,
        const BoundNetLog& net_log) override;

    void SetObserver(Observer* observer) override;

private:
    // Verify a list of SCTs from |encoded_sct_list| over |expected_entry|,
    // placing the verification results in |result|. The SCTs in the list
    // come from |origin| (as will be indicated in the origin field of each SCT).
    bool VerifySCTs(const std::string& encoded_sct_list,
        const ct::LogEntry& expected_entry,
        ct::SignedCertificateTimestamp::Origin origin,
        X509Certificate* cert,
        ct::CTVerifyResult* result);

    // Verifies a single, parsed SCT against all logs.
    bool VerifySingleSCT(scoped_refptr<ct::SignedCertificateTimestamp> sct,
        const ct::LogEntry& expected_entry,
        X509Certificate* cert,
        ct::CTVerifyResult* result);

    // Mapping from a log's ID to the verifier for this log.
    // A log's ID is the SHA-256 of the log's key, as defined in section 3.2.
    // of RFC6962.
    std::map<std::string, scoped_refptr<const CTLogVerifier>> logs_;

    Observer* observer_;

    DISALLOW_COPY_AND_ASSIGN(MultiLogCTVerifier);
};

} // namespace net

#endif // NET_CERT_MULTI_LOG_CT_VERIFIER_H_
